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The Topography of Frequency and Time Representation in Primate Auditory Cortices

Lookup NU author(s): Dr Simon Baumann, Dr Olivier Joly, Professor Adrian Rees, Professor Christopher Petkov, Dr Li Sun, Professor Alexander Thiele, Professor Tim Griffiths

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Natural sounds can be characterised by their spectral content and temporal modulation, but how the brain is organized to analyse these two critical sound dimensions remains uncertain. Using functional magnetic resonance imaging, we demonstrate a topographical representation of amplitude modulation rate in the auditory cortex of awake macaques. The representation of this temporal dimension is organized in approximately concentric bands of equal rates across the superior temporal plane in both hemispheres, progressing from high rates in the posterior core to low rates in the anterior core and lateral belt cortex. In A1 the resulting gradient of modulation rate runs approximately perpendicular to the axis of the tonotopic gradient, suggesting an orthogonal organisation of spectral and temporal sound dimensions. In auditory belt areas this relationship is more complex. The data suggest a continuous representation of modulation rate across several physiological areas, in contradistinction to a separate representation of frequency within each area.


Publication metadata

Author(s): Baumann S, Joly O, Rees A, Petkov CI, Sun L, Thiele A, Griffiths TD

Publication type: Article

Publication status: Published

Journal: eLife

Year: 2015

Volume: 4

Online publication date: 15/01/2015

Acceptance date: 14/01/2015

Date deposited: 17/12/2015

ISSN (electronic): 2050-084X

Publisher: eLife Science Publications Ltd.

URL: http://dx.doi.org/10.7554/eLife.03256

DOI: 10.7554/eLife.03256

PubMed id: 25590651


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